That Time I Got Reincarnated as a Slime (2018)

S1E18 Evil Creeps Closer

Phobio struggles to control his rage against Milim. He encounters Footman and Tear, two masked figures from the Moderate Harlequin Alliance, who propose that he transform into a Demon Lord to exact vengeance on her. They reveal that he can harness the power of Charybdis to achieve this goal. At the same time, the Jura Tempest Federation dispatches Youm on a mission to convince the world that he is the true hero who vanquished the Orc Lord.